A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?

Correct option is C. 0.16(AA); 0.48(Aa); 0.36(aa)

Frequency of dominant allele (say p) = 0.4
Frequency of recessive allele (say q) = 1 – 0.4 = 0.6
∴Frequency of homozygous dominant individuals (AA) = p² = (0.4)² = 0.16
Frequency of heterozygous individuals (Aa) = 2pq = 2(0.4)(0.6) = 0.48
Frequency of homozygous recessive individuals (aa) = q² = (0.6)² = 0.36.
So, the correct answer is '0.16(AA); 0.48(Aa); 0.36(aa)'.